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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5aaa5c085f026b3ffb20293d737301508b71650a4ed320edff971f6ad3c834a' 
  AND token = 'ObwRnRQ55CrH6+mvCteFy2qMCRbluRwRnCAJZWj24YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}